I brought my juices to work during my longest fast. Yes, they're not as nutriteous but I wasn't able to juice at work. The stored juices got me through just fine. :) Besides I only drank one juice and lots of herbal tea while at work.
I have never done the SWF (Salt-Water-Flush) while juice fasting. Enemas and occasional lax tea are the methods I've used and generally the most popular methods used while juice fasting.